Add a "Copy BibTeX" button to each Google Scholar result and copy BibTeX in one click. Uses GM_xmlhttpRequest to bypass CORS issues.
// ==UserScript==
// @name Google Scholar: One-Click Copy BibTeX (GM_xmlhttpRequest fix)
// @namespace franz.tools.scholar.copybib
// @version 0.5.0
// @description Add a "Copy BibTeX" button to each Google Scholar result and copy BibTeX in one click. Uses GM_xmlhttpRequest to bypass CORS issues.
// @author Franz
// @match *://scholar.google.com/scholar*
// @match *://scholar.google.com.hk/scholar*
// @include /^https?:\/\/scholar\.google\.[^\/]+\/scholar.*/
// @run-at document-end
// @grant GM_setClipboard
// @grant GM_xmlhttpRequest
// @connect scholar.googleusercontent.com
// @license MIT
// ==/UserScript==
(function () {
'use strict';
const RESULT_CONTAINER_SELECTOR = '.gs_r.gs_or.gs_scl';
const RESULT_INNER_SELECTOR = '.gs_ri';
const ACTION_BAR_SELECTOR = '.gs_fl';
const CITE_LINK_SELECTOR = 'a.gs_or_cit, a[aria-controls="gs_cit"]';
const BTN_CLASS = 'copy-bibtex-btn';
injectStyle(`
.${BTN_CLASS} {
font: 13px/1.4 Arial, sans-serif;
padding: 0 8px;
margin-left: 8px;
cursor: pointer;
border: 1px solid rgba(0,0,0,0.25);
background: #f8f9fa;
border-radius: 3px;
color: #202124;
height: 24px;
}
.${BTN_CLASS}:disabled { opacity: 0.6; cursor: default; }
.${BTN_CLASS}.ok { background: #e6f4ea; border-color: #34a853; }
.${BTN_CLASS}.fail { background: #fce8e6; border-color: #d93025; }
.copy-bibtex-toast {
position: fixed; right: 16px; bottom: 16px;
background: rgba(32,33,36,.95); color: #fff;
padding: 8px 12px; border-radius: 6px;
z-index: 999999; font: 13px/1.3 Arial, sans-serif;
box-shadow: 0 4px 18px rgba(0,0,0,.25);
}
`);
addButtonsToAll();
observeForNewResults(() => addButtonsToAll());
function addButtonsToAll() {
const results = document.querySelectorAll(RESULT_CONTAINER_SELECTOR);
for (const res of results) {
if (res.dataset.copyBibInjected === '1') continue;
const inner = res.querySelector(RESULT_INNER_SELECTOR);
if (!inner) continue;
const actionBar = inner.querySelector(ACTION_BAR_SELECTOR) || inner;
const citeAnchor = inner.querySelector(CITE_LINK_SELECTOR);
const cid = extractCitationId(res, citeAnchor);
if (!cid) continue;
const lang = document.documentElement.getAttribute('lang') || 'en';
const citeUrl = new URL('/scholar', location.origin);
citeUrl.searchParams.set('hl', lang);
citeUrl.searchParams.set('q', `info:${cid}:scholar.google.com`);
citeUrl.searchParams.set('output', 'cite');
const btn = document.createElement('button');
btn.type = 'button';
btn.className = BTN_CLASS;
btn.textContent = 'Copy BibTeX';
btn.addEventListener('click', async (e) => {
e.preventDefault();
e.stopPropagation();
await handleCopy(btn, citeUrl.toString());
});
actionBar.appendChild(btn);
res.dataset.copyBibInjected = '1';
}
}
function extractCitationId(resultEl, citeAnchor) {
let cid = citeAnchor?.dataset?.cid || citeAnchor?.getAttribute?.('data-cid')
|| citeAnchor?.dataset?.id || citeAnchor?.getAttribute?.('data-id')
|| resultEl.getAttribute('data-cid');
const href = citeAnchor?.getAttribute?.('href') || '';
if (!cid && href) {
const m = href.match(/info:([^:]+):scholar\.google\.com/);
if (m) cid = m[1];
}
return cid || null;
}
async function fetchBibTeX(citePageUrl) {
// Step 1: fetch cite page normally
const resp = await fetch(citePageUrl, { credentials: 'include' });
if (!resp.ok) throw new Error(`Cite page HTTP ${resp.status}`);
const html = await resp.text();
const doc = new DOMParser().parseFromString(html, 'text/html');
// Step 2: find BibTeX link
const bibLink = Array.from(doc.querySelectorAll('a')).find(a => /BibTeX/i.test(a.textContent || ''));
if (!bibLink) throw new Error('BibTeX link not found');
const bibUrl = new URL(bibLink.getAttribute('href'), location.origin).toString();
// Step 3: fetch BibTeX with GM_xmlhttpRequest (bypass CORS)
return new Promise((resolve, reject) => {
GM_xmlhttpRequest({
method: "GET",
url: bibUrl,
onload: function (r) {
if (r.status === 200) resolve(r.responseText);
else reject(new Error(`BibTeX HTTP ${r.status}`));
},
onerror: function (err) {
reject(new Error(`BibTeX request failed: ${err.error}`));
}
});
});
}
async function writeClipboardRobust(text) {
try {
GM_setClipboard(text, { type: 'text', mimetype: 'text/plain' });
return true;
} catch (_) {}
if (navigator.clipboard?.writeText) {
await navigator.clipboard.writeText(text);
return true;
}
showManualCopy(text);
return false;
}
async function handleCopy(btn, citeUrl) {
const origText = btn.textContent;
try {
btn.disabled = true;
btn.textContent = 'Fetching…';
const bib = await fetchBibTeX(citeUrl);
btn.textContent = 'Copying…';
const ok = await writeClipboardRobust(bib);
if (ok) {
btn.textContent = 'Copied ✓';
btn.classList.add('ok');
showToast('BibTeX copied to clipboard.');
} else {
btn.textContent = 'Copied (manual)';
btn.classList.add('ok');
showToast('Clipboard blocked. Manual copy dialog opened.');
}
} catch (err) {
console.error('[Copy BibTeX] Error:', err);
btn.textContent = 'Failed';
btn.classList.add('fail');
showToast('Failed to copy BibTeX. See console for details.');
} finally {
setTimeout(() => {
btn.disabled = false;
btn.textContent = origText;
btn.classList.remove('ok', 'fail');
}, 1400);
}
}
function observeForNewResults(onChange) {
const mo = new MutationObserver((mutations) => {
for (const m of mutations) {
if (m.addedNodes && m.addedNodes.length) { onChange(); break; }
}
});
mo.observe(document.body, { childList: true, subtree: true });
}
function showToast(msg) {
const el = document.createElement('div');
el.className = 'copy-bibtex-toast';
el.textContent = msg;
document.body.appendChild(el);
setTimeout(() => el.remove(), 1600);
}
function showManualCopy(text) {
const overlay = document.createElement('div');
overlay.style.cssText = `
position: fixed; inset: 0; background: rgba(0,0,0,.4); z-index: 999999;
display: flex; align-items: center; justify-content: center; padding: 24px;
`;
const panel = document.createElement('div');
panel.style.cssText = `
background: #fff; padding: 16px; border-radius: 8px; max-width: 800px; width: 90%;
box-shadow: 0 8px 30px rgba(0,0,0,.25); font: 13px Arial, sans-serif;
`;
const info = document.createElement('div');
info.textContent = 'Clipboard blocked. Press ⌘/Ctrl+A then ⌘/Ctrl+C to copy:';
info.style.marginBottom = '8px';
const ta = document.createElement('textarea');
ta.value = text; ta.rows = 16; ta.style.width = '100%';
const closeBtn = document.createElement('button');
closeBtn.textContent = 'Close';
closeBtn.style.cssText = 'margin-top: 8px; padding: 4px 10px;';
closeBtn.onclick = () => overlay.remove();
panel.append(info, ta, closeBtn);
overlay.append(panel);
document.body.appendChild(overlay);
ta.focus(); ta.select();
}
function injectStyle(css) {
const style = document.createElement('style');
style.textContent = css;
document.head.appendChild(style);
}
})();